261328230178 has 16 divisors (see below), whose sum is σ = 429362813880. Its totient is φ = 118737369856.

The previous prime is 261328230173. The next prime is 261328230197. The reversal of 261328230178 is 871032823162.

It can be written as a sum of positive squares in 4 ways, for example, as 188944094329 + 72384135849 = 434677^2 + 269043^2 .

It is not an unprimeable number, because it can be changed into a prime (261328230173) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 132518401 + ... + 132520372.

Almost surely, 2^261328230178 is an apocalyptic number.

261328230178 is a deficient number, since it is larger than the sum of its proper divisors (168034583702).

261328230178 is a wasteful number, since it uses less digits than its factorization.

261328230178 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 265038821.

The product of its (nonzero) digits is 193536, while the sum is 43.

The spelling of 261328230178 in words is "two hundred sixty-one billion, three hundred twenty-eight million, two hundred thirty thousand, one hundred seventy-eight".